For the extension Akeeba Backup Core package version 8.2.2 is available, but it requires at least PHP version 7.2 while your system only has 7.1.0

XIPE Science Study Team (XSST)

Surname and NameCountryInstitute
Soffitta Paolo (Lead Scientist) Italy INAF-IAPS
Bellazzini Ronaldo Italy INFN-Pi
Courvoisier Thierry Switzerland University of Geneva
Goosmann Rene France Obs. Astron. de Strasbourg
Matt Giorgio Italy Univ. Roma 3
Reglero Victor Spain Univ. of Valencia
Santangelo Andrea Germany IAAT
Tagliaferri Gianpiero Italy INAF-OA Brera
Vink Jacco The Netherlands Univ. of Amsterdam
Zane Silvia United Kingdom MSSL-UCL